| 摘要 |
PROBLEM TO BE SOLVED: To enable the operation of a communication circuit while a battery mounted on a communication device is charged by wireless power feeding, and to prevent damage of the communication circuit while a secondary battery is charged.SOLUTION: A communication device 1 includes a communication coil 11, a power-receiving section 12, a charge control section 13, a first switch section 18, a second switch section 15, a communication circuit 16, and a processor 17. In response to the excess of a power-feeding threshold voltage Vth0 of a terminal voltage of the communication coil, a voltage detection circuit 121 of the power-receiving section generates a first control signal Cnt1 of a first state "H". In response to the first control signal Cnt1, a state between a first terminal T1 and a third terminal T3 of the first switch section is controlled to be in an on-state. In response to the excess of charge threshold voltages VthH and VthL of the terminal voltage of the communication coil while a secondary battery 14 is charged, the voltage detection circuit generates a second control signal Cnt2 of a third state "L". In response to the second control signal Cnt2, the second switch section is controlled to be in an off-state. |
